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( Tran Thi Thuy Nga ),권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
In this study, we synthesize GAP-base particles as an adsorbent containing azide groups which are known as one of highly reactive groups and its ability to remove metal ions due to a strong coordination with these metal ions. The spherical particles containing azide groups are prepared by suspension method via a reaction of glycidyl azide polymer (GAP) and bis-propargyl succinate (BPS) and an aid of polyvinyl alcohol (PVA). Cu-free Click reaction occurs via azide groups of GAP and alkyne groups of BPS. The changing of agitation speed, concentration of PVA and content of organic phase affects to particle size and particle size distribution. The spherical shape and mechanical properties of particles are obtained by SEM and TGA, DMA, DSC measurements. The efficiency of removing metal ions is obtained by adsorption Hg2+ and Pb2+. Freundlich isotherm model is used to describe the adsorption process. GAP-base particle is the promising adsorbent for wastewater treatment containing metal ions.
Flexible Display ; Low Temperture Processes for Plastic LCDs
JeongInHan 한국전기전자재료학회 2003 Transactions on Electrical and Electronic Material Vol.4 No.2
Flexible displays such as plastic-based liquid crystal displays (LCDs) and organic light-emitting diode displays (OLEDDs) have been researched and developed at KETI since 1997. The plastic film substrate is very weak to heat and pressure compared to glass substrate, that its fabrication process is limited to 110℃ and low pressure. The ITO films were deposited on the bare plastic film substrate by rf-magnetron sputtering. Moreover, in order to maintain uniform cell gap and pressure on the plastic film substrate, we utilized newly-invented jig and fabrication process. Electro-optical characteristics were better than or equivalent to those of typical glass LCDs though it is thinner, lighter-weight, and more robust than glass LCDs.
Development of 2-inch Plastic Film STN LCD
Park, Sung-Kyu,Han, Jeong-In,Kim, Won-Keun,Kwak, Min-Gi The Korean Infomation Display Society 2000 Journal of information display Vol.1 No.1
Due to distinct properties of plastic substrates such as poor thermal resistance, non-rigidness and high thermal expansion, it is difficult to fabricate plastic film LCDs by conventional LCD processes. Poor thermal resistance and high thermal expansion of substrates induced deformation of substrates surface, mismatch of thermal expansion between ITO electrodes and substrates resulted in defects in the ITO electrodes during the high temperature process. Defects of ITO electrodes and non-uniform cell gap caused by non-rigid and flexible properties were also observed in the pressuring process. Based on in these observations, we used a newly developed material and fabrication process to prevent deformation of substrates, defects of electrodes and to maintain uniform cell gap. The maximum temperature of the process is limited up to $110^{\circ}C$ and pressure loaded during the process is five times less than conventional one. With these invented processes and materials, we obtained highly reliable Plastic Film STN LCDs whose electro-optical characteristics are better than or equivalent to those of typical glass LCDs.
Flexible Display i Low Temperature Processes for Plastic LCDs
Han, Jeong-In The Korean Institute of Electrical and Electronic 2003 Transactions on Electrical and Electronic Material Vol.4 No.2
Flexible displays such as plastic-based liquid crystal displays (LCDs) and organic light-emitting diode displays (OLEDDs) have been researched and developed at KETI since 1997. The plastic film substrate is very weak to heat and pressure compared to glass substrate, that its fabrication process is limited to 110$^{\circ}C$ and low pressure. The ITO films were deposited on the bare plastic film substrate by rf-magnetron sputtering. Moreover, in order to maintain uniform cell gap and pressure on the plastic film substrate, we utilized newly-invented jig and fabrication process. Electro-optical characteristics were better than or equivalent to those of typical glass LCDs though it is thinner, lighter-weight, and more robust than glass LCDs.
방한서,김성환,김종명 조선대학교 생산기술연구소 1998 生産技術硏究 Vol.20 No.2
The groove for proper welding joints is required to obtain a complete joint penetration However, fillet joint welding without edge preparation is often adopted to save coats and manhours. In this case, gaps of root may occurs, which cause stress concentration around gaps of root and compromises structural safety. In this paper, double fillet welded T-joints are selected for investigation. The welding residual stresses on the plate, web and notches of roots are calculated under two dimensional heat conduction and plane deformation thermal elasto-plastic theory are applied. It is found that multi pass welding alleviates stress concentration on the notch tips of roots by distributing the compressed residual stresses and external tensile forces in the direction of the width of web may restrict the occurrence of root-crack since the compressive residual stresses is expected in that direction. Through this results, in case of acting tensile force for the direction of the width of web, we supposed that occurrence of root-crack is restricted under the influence of compressed residual stress around notch-tip of root.
( Tran Thi Thuy Nga ),서민영,권영환 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In this study, we synthesized GAP-based particles contain functional azide groups on the surface as a polymeric adsorbent applied to remove metal ions. The stable particles were prepared by suspension method. Glycidyl azide polymer was crosslinked by bis-propargyl succinate via Cu-free Click reaction. Effect of suspension parameters were studied on particle size and partilce size distribution to provide control size of particles. The presence of azide groups on particles was showed at 2097 cm-1 through FTIR result and its spherical morphology was observed by microscope measurement with different sizes from 0.25-1.4mm. TGA results showed high thermal stability of particles through high decomposition temperature at 240°C. Adsorption experiment was studied on Hg(II), Pb(II) metal ions. Freundlich isotherm model was used to describe the heterogeneous adsorption between particles and Pb(II) while Linear isotherm model predicted the adsorption process for Hg(II).
Plastic η factor considering strength mismatch and crack location in narrow gap weldments
Koo, J.M.,Huh, Y.,Seok, C.S. North-Holland Pub. Co 2012 Nuclear engineering and design Vol.247 No.-
The fracture toughness for LBB analysis of piping is generally determined in terms of the J-integral according to ASTM E1820. The J-integral consists in the elastic component J<SUB>el</SUB> and the plastic part J<SUB>pl</SUB>. Experimental evaluation of J<SUB>pl</SUB> requires the plastic η factor. The J-integral evaluation by ASTM method was developed, however, essentially for homogeneous material. The fracture toughness of a strength mismatch weld evaluated as per ASTM method can, thus, differ from its actual value. In this study, the plastic η factors of similar as well as dissimilar metal narrow gap weld are suggested considering the influence of weld strength mismatch, weld width, and crack location. The proposed plastic η factors are compared with detailed finite element results. Few fracture tests were performed to quantify the influence of weld strength mismatch on fracture toughness of low alloy steels using C(T) specimens.
허용(Yong Huh),조성근(Sung-Keun Cho),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this study, the plastic -factors of SA508 narrow-gap welding part used for the primary piping system of nuclear power plant were obtained using the finite element analysis and suggested the revised fracture toughness testing method for the narrow-gap welding part. Also, we have performed the fracture toughness test for SA508 narrow-gap welding part applying the new testing method then compared the results with those by fracture toughness test according to ASTM.
임플란트 식립 방향에 따른 상부구조물의 정확도 차이에 관한 비교연구
김태석,임재석 고려대학교 임프란트연구소 2001 임프란트연구지 Vol.3 No.1
The gap discrepancies between cast implant superstructure supported by two fixtures aligned without puntic and fixture replica were measured utilizing stereomicroscope with the assumptions that the direction of two fixtures was parallel or in convergent relation(20˚). The results were as follews : 1.The gap discrepancies measured between the replica and implant superstructure cast with plastic burn-out cylinder using non-precious alloy were 6.04±1.07㎛. 2.The gap discrepancies of non-parallel replica were 119.24±15.73㎛(Mean±SD) and that of parallel replica were 87.02±17.54㎛(Mean±SD), which show statistically significant difference (P〈0.001).